<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .box {}
  </style>
</head>

<body>
  <script>
    // 推荐方式一: log -> enter
    console.log("Hello World");
    // 推荐方式二: react插件 -> clg
    console.log(first)
    //函数
    function sayHello() {

    }

  </script>
</body>

</html>